Expansion and contraction joint



Feb 1933. A. c. FISCHER EXPANSION AND CONTRACTION JOINT Filed Oct. 19,1925 Patented Feb. 21, 1933 umren STATES mnn'r c. nscm o1- cmcneo,minors, xssmuon r 'rnnrmn' canny racrunmc comm, a conronarron or 01110PATENT orrlce I EXPANSION AND OON'IEACTION JOINT Application ma October19, 1925. serial No. 63,362.

This application is a continuation in artof application Serial No.526,742 filed anuary 3,-1922, and which matured into Patent No.1,655,835 on January 10, 1928.

I f My invention relates primarily to utilizmg a-preformed piece of exanslon joint as an expansion contraction joint, by properly staking saidexpansion joint in position and pouring the concrete over the top .aswell as the sides, it being preferable that the material over the expanson joint should not exceed 1% inches in thickness, the purpose of whichwill be hereinafter explained.

This invention has to do largely with a control of the material and acorrection of a fault whichwas apparent inthe prior art, especiallywhere a two course pavement was laid. It has been customary to layexpansion joint in a trough like form in the base,

er, expansion joint in the upper course.

It was not the intention or purpose that the expansion material thusprovided he used as a contraction joint and placed in such a manner thatthe concrete would be likely to break over the top of said expansionmaterial. By controlling the flow of the expansion material in warmweather to reduce its oozing qualities to a minimum, viz., 'byincorporating approximately fifteen (15) or twenty-five (25) per cent offibrous matter, I the oozing properties can be greatly controlled, andwhen this is done, when the concrete cracks above the expansioncontraction fijoint, the warm temperature will cause a sufexpansionmaterial, which would remain inthe base, and would thus allow thesurface of the materialto remain uniform and even.

claims and illustrated by tlie accompanying and, at a distance from suchunderlying lay The invention consists m me construction, arrangement andcombination of elements hereinafter set forth, pointed out in thedrawing, in which Figs. 1, 2 and 3 are perspective views of pavingstructures embodying my invention; and Fig. 4 illustrates a modifiedtype of pav ing structure.

My invention can best'b'e understood by referring'to Figure 1, in whicharepresents a preformed expansion joint and e/- the concrete mass formedabout it. Ths illustration shows the position of the j oinfi and therelationship of the concrete about it pre vious to a crack forming.

At the top of the material a Figure 2 illustrates this same mass showingthe expansion material -a with the concrete poured about it, theexpansion material reaching thru the greater part of the concrete mass,and upon contractionof the material a crack being formed as at f in theconcrete v mass e. This crack does not widen rapidly and is a verynarrow crevice, that when the mass is heated up by the rays of .the s'unor the temperature, the slight flow of the material --aworks its waythru the crevice tothe surface fof the street, thus keeping the crevicewaterproof.

Figure 3 illustrates expansion material ivhich'has worked up into thecrevice f-- as shown at g the crevice being formed of the concrete mass-e.

As previously explained, the difliculty with heretofore practisedmethods, particularly in instances where a pavement is laid in courses,is that the expansion joint material placed in the base course has beentoo readily flowable, so thatat higher temperatures expansion of theconcrete will cause the expansion joint material to ooze between theupper and lower course, with the result that the surface of the market,from the asphalt joints to fibrated joints, all of which havecomparatively similar percentages of asphalt in them, as described. infigure -a at Figure 4.

The utility of this product can readily be understood when the methodsdescribed and the proper materials are utilized for the respectivepurposes, as outlined in the figures shown and the materials employed.

' I claim:

1. A paving structure comprising a monolithic layer of paving material,and a bituminous expansion joint embedded beneath the paving surface toprovide a weakened area in the paving structure, over which cracks arecaused subsequently to develop, said joint bein adapted to flow to fillthe cracks as' they develop.

2. A pavin structure comprising a mono lithic layer 0 concrete paving,and a fibrated bituminous joint embedded beneath the concrete surface toprovide a weakening area in the structure over which cracks are causedsubsequently to develop, said joint being adapted to flow into thecracks as they develop. f

3. The method of forming a paving structure characterized by positloninga bituminous expansion strip in a section to be paved, and flowing amonolithic layer of concrete over the strip.

4. The method of forming a paving structure having weakened seamstherein charac-,

terized by positioning a waterproofed ex ans1on strip in a section to bepaved, and owmg a monolithic layer of concrete over the strip.

5. A paving.structure comprising a monolithic layer of paving materialgrooved to provide a weakened area adjacent which cracks are caused todevelop, and a waterproofing strip inserted in the groove and formed ofmaterial adapted to ooze into the crack and seal the same.

- 6. A paving structure comprisin a monolithic layer of paving materialhaving a groove to provide a weakened area adjacent which cracks arecaused to develop, and a strip inserted in the groove and containing awaterproofing material adapted to ooz into the crackand seal the same. r

7. A paving structure comprisinga monolithic layer of paving materialgrooved to provide a weakened area adjacent which cracks are caused todevelop, and a waterroofing strip inserted in the groove, and orlned ofplastic bituminous material adapted to pass into the crack and seal thesame.

8. A paving structure comprising: monolithic layer of paving materialaving a groove to provide a weakened area adjacent which cracks arecaused to'develop, and a strip inserted in the groove and containing aplastic bituminous waterproofing material adapted to pass into the crackand seal the same. 1

9. The method of forming a paving structure characterized by oovmg amonolithic layer of pavin material to provide a weakened area in which acrack may develop, and filling the groove with a waterproofing stripformed of material adapted to ooze into the crack and seal the same.

10. The method of forming a paving structure characterized by grooving amonolithic layer of pavin material to provide a weakened area in which acrack may develop, and filling the groove with a strip containing awaterproofin material adapted to ooze into the crack and seal the same.

' 11. Apavin structure comprising amonolithic layer 0 paving'materialgrooved to provide a weakened area adjacent which cracks are caused todevelop, and a waterproofing strip inserted in the groove and formed ofmaterial adapted to pass into the crack andseal the same.

12. A pavin structure comprising a monolithic layer of paving materialgrooved to provide a weakened area in which a crack may develop, and awaterproofin strip inserted in the groove formed 0 material adapted topass into the crack and seal the same.

Signed at Chicago, Illinois, this 13th day of October, 1925.

ALBERT C. FISCHER.

